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首页> 外文期刊>Combustion Science and Technology >ESTABLISHMENT OF A CONFINED SWIRLING NATURAL GAS/AIR FLAME AS A STANDARD FLAME: TEMPERATURE AND SPECIES DISTRIBUTIONS FROM LASER RAMAN MEASUREMENTS
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ESTABLISHMENT OF A CONFINED SWIRLING NATURAL GAS/AIR FLAME AS A STANDARD FLAME: TEMPERATURE AND SPECIES DISTRIBUTIONS FROM LASER RAMAN MEASUREMENTS

机译：建立标准旋流天然气/空气火焰：激光拉曼测量的温度和物种分布

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摘要

A prototype of an industrial burner for confined swirling natural gas diffusion flames with thermal powers in the range of 100 to 300 kW is presented. Within the TECFLAM research cooperation, a well-defined "standard flame" was investigated in this burner with complementary measuring techniques to yield a comprehensive characterization of the combustion process. The aims of the investigations were a better understanding of the complex physical and chemical processes, their interactions in turbulent swirling flames, and the establishment of a database that can be used as a test case for numerical simulations. The results from single-pulse Raman measurements of the temperature, mixture fraction, and major species concentrations are presented. The global flame behavior is illustrated by the spatial distributions of the mean values and fluctuations of the temperature and mixture fraction. The different flame regions and their characteristic features are discussed. The main objective is the investigation of finite-rate chemistry effects, which can be deduced from the correlations between the various simultaneously measured quantities (scatterplots). Within the shear layers and the region of flame reactions, large deviations from chemical equilibrium are observed, which can be attributed to local flame extinction and ignition delay. Further discussion points are the stabilization mechanism of the flame and the influence of turbulent mixing on the thcrmochemical state. Finally, the effect of increased swirl on the flame behavior is illustrated and discussed.
机译：提出了一种工业燃烧器的原型，该燃烧器用于限制旋转的天然气扩散火焰，其火力范围为100至300 kW。在TECFLAM的研究合作中，使用补充的测量技术在此燃烧器中研究了定义明确的“标准火焰”，以全面表征燃烧过程。研究的目的是更好地理解复杂的物理和化学过程，它们在湍流涡流火焰中的相互作用以及建立可用作数值模拟测试案例的数据库。给出了单脉冲拉曼测量的温度，混合物分数和主要物质浓度的结果。总体火焰行为通过平均值的空间分布以及温度和混合物分数的波动来说明。讨论了不同的火焰区域及其特征。主要目标是研究有限速率化学效应，可以从同时测量的各种量（散点图）之间的相关性推导得出。在剪切层和火焰反应区域内，观察到与化学平衡的较大偏差，这可归因于局部火焰的熄灭和点火延迟。进一步的讨论要点是火焰的稳定机理以及湍流混合对热化学状态的影响。最后，说明并讨论了旋流增加对火焰行为的影响。

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